Stop device



June 18, 1946.

H. L. TRA'UTMANN STOP DEVICE Filed Ma 25, 1945 Heeez L Z AQTMANNA INVENTOR.

' ATTORNEY.

Patented June 18, 1946 Herbert" Trautniann, Lo's Angles, came, as si'gnor't'o' Zephyr Manufacturing 60., Inglewood,

Califi, a copartnership composed of Dr L. Dotson; H. L.. T'raut'mamn, and J ay Harkey Application May 25, 1943,. Serial.No.- 488,421

2" Glaims; (Cl. 77- -7315)" 1: My invention" relates to a toof and has particular" reference to a micrometer stop device finding" particular utility when employed with count'ersinks; end mills" and like cutting tools;

In the manufactureof various types of mech-- anisms and devices it is often necessary-to countersink previously drilled holes, as for example, to accommodate the heads of fiat head screws or to" counterbore' enlargements in previously drilled holes, as for example, to accommodatethe heads of shoulder screws, stop pins and similar machine elements. In this character of machine operation, it is highly desirablethat the depth to which the countersinkin'g or counterboring operation is carriedbe controlled within precise limits sothat, for example; the protruding portion of a; shoulder screw may bear a fixed relation tot-he part to which it is'secured or, for example, so that" the head of a flat head screw may fit down precisely flush with" the surface.- into which theccuntersink i formed.

Prior to my invention ithas been the practice to use stop-mechanisms associated with counters'inking or counterboring tool's, these. mechanisms being-arranged to engagethesurface of the workpiece and arrest the longitudinal movement of the cutting tool when the cutting operation has been carried to the desired depth.

The: prior devices have not been entirely satisfactory for the reason that they do not provide a ready" means of adjusting the depth towhi'chithe cutting:- operation will be: carried before"; the; stop arrests-the movement of the cuttingtooL It is therefore; an object of my invention toprovide a stop device. for. use with countersinks, boring tools and like cutters; which overcomes the: above noted: disadvantages: of being readily and accurately adjustable Without. the: use of tightening tools. to provide for variable. amounts: t cutting: movement of the. tool before the stop device arrests the operation of the: tool.

It is additionally an object ofi my invention to:

provide: a stop: of the character? set forthiin the:

preceding; paragraph, which is rotatably'mounted on' the cutting tool so; that the same maybe held:- stationary in the hand' while' the toola rotates with respect to'the stop to permit the tool t'o be guided by hand into: the: opening to be: count sunkor counterbored. I

It is a still further: object at my inventiomtof provide a. stop of the. character hereinhefor'e re ferred to which employs-a minimum number'of: simply constructed parts to: reduce. to a minimum the -costiofmanufacturing theistopand to re'du'ce maintenance and: operating coststoaminimum;

. Itzis: also" an object of my invention to providea: stop-:01 the character set forth in the preceding paragraphs which employs a novel adjust: ing mechanism for adjustingtherelation between the stop and the cutting tool.

other" objects and advantages of my invention will be apparent from'aflstudy' of the following specifications, read in connection with the accompanying drawing; wherein Fig; l'is an elevational View of the preferred embodiment of my invention as applied to a countersinking' tool;

Fig. 2 is a longitudinal' sectional view of the device shown in Fig; 1- and illustrating the relative positions ofthe parts when the device is ready foruse;

Fig. 3 isa view'simila'r to Fig. 2 but illustrating themanner in which theadjusting device is manip'ulat'ed in order to change the location of the 1 stoprelative to the cutting tool; and

Fig. i is a-cross sectional view taken substantially alen'g the lii'ieIV-JV of Fig: 3.

Referring to the drawing, I have illustrated in- Fig: 1 the: preferred embodiment of my invention as comprising a; countersinking' tool I which is surrounded by a stop member 2-. The

countersinkin'g element I is formed on a shaft 3- which is radially enlarged as indicated at 4- andconn'e'ct'ed; to a; stemor shank 5 adapted t'o-be receivedfand cl'amped within the chuck of an electric drill or'similar power tool.

The countersinking' element I is provided with cutting. edges 6 arranged. in the conventional manner and carries a pilot 1 adapted to enter the hole Wl'fi'ChZ iS tmbI-i countersunk and which serves: to'guidei and center" the tool during operation.

The-stop mechanism. 2 includes abearing sleeve 8" which is: bored: as indicated at 9 to rotatably receive; the: shaftv 3:. The upper end of the sleeve 8-defines a radially disposed face IU upon whichis-rested'a: ballar'etainer H The ballretainer ll, togetherwith the-"enlargement 4 and'balls I2'comprises: a thrust hearing: by means of which v axial loads on the-sleeve 8 shaft 3 and shank..5.

The outer surfaceof thesleeve 8 is" threaded as: indicated at I3 to permit attachment-theretoto: receive the cuttingtool'or countersink I. The

stop: member 51 t terminates in a lower plane face IITL'WhiChI' is. disposed at: right. angles to the axis of; the. shaft 3. and: which is adapted tobear against th surface: of the. workpiece being cut and arrest downward movement of the countersick; i. The stop: member I4 is preferably cut away at one or: more: places as indicated at I 8" to provide apertures throughwhich chips and-cut ti-ngs= may be discharged.

Withthis construction it will be noted that the stop member! may be" held against" rotation as, forexarnp'l'e; by'h'and whiiethe shaft 3andcountersink I may be rotated. This permits the stop may be transmitted to the the threadshi and: which. is counterbored-as-indicated at It device 2 to .be held in the hand for the. purpose of guiding the pilot 1 into the sunk or counterbored while the cutting tool is beingrotated. It will also be noted that as the tool advances during the cutting operation, the stop face I! will advance toward the workpiece. When the stop face I! engages the workpiece, further feeding movement of the tool is arrested by virtue of the thrust connection between the sleeve 8 and the shaft 3 afforded by the ball bearings l2.

The depth to which the countersinking operation is carried is controlled by the position of the stop member l4 relative to the sleeve 8, this position being adjustable through the threaded engagement l3-l5 upon rotation of the member 14 relative to the sleeve 8.

To permit such adjusting movement of the parts 8 and I4 and to permit locking these' parts against movement once the desired adjustment has been attained, I provide a stop lock member. l9 which preferably comprises a cylindrical sleeve overlying the member l4 and including an inwardly extending radial flange 20. A compression spring 2! is interposed between the flange 2 and an outwardly projecting radial flange 22 provided on the exterior of the member l4, the spring 2| thus serving to urge the stop lock member l9 upwardly with respect to the member l4. Thestop lock member I9 is non-rotatably keyed to the member 14 for axial sliding movement relative thereto as by providing in the member I4 an axial keyway 23 adaptedto receive a key or pin 24 carried by the stop lock member l9. 7

The upper end of the sleeve 8 identified by the reference character 25 is preferably provided with a hexagonal cross section as is indicated in Fig. 4. This hexagonal cross section is normally received within a portion of the interior of the stop lock member l9 whichis disposed above the flange 20, this portion being provided with a plurality ,of short axially extending V-shaped grooves 26 each of which preferably has an angle of 120 so that the corners of the hexagonal portion 25 may be received within the grooves in the manner shown in Fig. 4.

This inter-engagement between the hexagonal portion 25 and the stop lock sleeve l9 serves to hold the member l4 against rotation relative to the sleeve 8.. By sliding the member l9 downwardly against the force of the compression spring 29 to a point such as that illustrated in Fig. 3, the stop lock member 19 may be disengaged from the head 25 of the sleeve 8 whereupon the stop lock member l9 may be rotated to thereby rotate the stop member 14 through the interconnection afforded by the key 24 and the kcyway 23. As previously stated, this rotation of the member l4 serves to adjust its position relative to the cutting element I. When the desired adjustment is obtained the stop lock member 19 is released and the spring 2| returns the same to the upper position which is illustrated in Fig. 2, again engaging the corners of the hexagonal member 25 with the V-shaped grooves 26 to hold the member l4 against rotation relative to the sleeve 8.

From the foregoing it will be observed that I have provided a novel stop mechanism for countersinks, boring tools and like devices which is susceptible to ready and accurate adjustment to control the depth to which the countersinking or counterboring operation will be carried,

It will also be noted that in the form of the hole to be counter invention shown, the outer parts of the device including the stop member itself are rotatably mounted upon the cutting tool so that these outer parts may be held in the hand while the tool is operating, thereby assisting in the guiding of the tool by hand into the bore to be countersunk or counterbored.

While I have described the preferred embodiment of my invention as adapted to a countersinking tool, it is to be realized that the same may be used with equal facility with counterbores, reamers and cutting tools of like character in those cases where it is desired to limit the distance the tool is fed axially.

While I have shown and described the preferred embodiment of my invention, I do not desire to be limited to any of the details of construction shown or described herein, except as defined in the appended claims.

, I claim:

1. In a stop device for limiting the axial movement of a rotating cutting tool, the combination of: a shank on said tool defining a thrust shoulder; a thrust sleeve surrounding said shank between said shoulder and said tool, said sleeve being mounted on said shank for rotation relative thereto and including a lock portion having a regular polygonal cross section; a thrust bearing interposed between said sleeve and said shoulder; a stop member surrounding said sleeve, said stop member being threadedly connected to said sleeve; a lock sleeve surrounding said thrust sleeve and including an end portion surrounding said lock portion, said end portion having formed in the inner surface a plurality of uniformly spaced grooves for receiving the corners of said polygonal cross section, the number of said grooves being a whole number multiple greater than one of the number of sides of said polygonal cross section; and means mounting said lock sleeve on said thrust sleeve for non-rotatable sliding movement relative thereto from. one position in which said corners are received in said grooves to another position in which said corners are free of and spaced from said grooves.

2. In a stop device for limiting the axial movement of a rotating cutting tool, the combination of: a shank on said tool defining a thrust shoulder; a thrust sleeve surrounding said shank between said shoulder and said tool, said sleeve being mounted on said shank for rotation relative thereto and including a lock portion having a regular polygonal cross section; a thrust bearing interposed between said sleeve and said shoulder; a stop member surrounding said sleeve, said stop member being threadedly connected to said sleeve; a lock sleeve surrounding saidthrust sleeve and including an end portion surrounding said lock portion, said end portion having formed in the inner surface a plurality of uniformly spaced grooves for receiving the corners of said polygonal cross section, the number of said grooves being a whole number multiple greater than one of the number of sides of said polygonal cross section; means mounting said lock sleeve on said thrust sleeve for non-rotatable sliding movement relative thereto from one position in which said corners are received in said grooves to another position in which said corners are free of and spaced from said grooves; and spring means interposed between said stop sleeve and said thrust sleeve for urging said thrust sleeve toward said one position,

HERBERT L. TRAUTMANN. 

